Vintage Synth Repair

Anyone with circuit diagram or service manual?

I keep getting messages about ILL and then an address or PRC and then an address and it then locks up.

It has been intermittent for a couple of months, but it is now unusable.

I have checked leads and reseated anything with sockets as well as replacing the SRAM battery.

I replaced the SM power supply about 7 years ago and as I bought the Morpheus new I know the first lasted from '93 to 2011.

The voltages from the power supply is + and - 12v and a double wire of 5V.

The 5V supply is 4.7V loaded and 5.0V unloalded (caps going?).

As well as the audio the 12V is 7805'd and feed to the program ROM

Is this low 4.7V enough to generate such errors?

Any E-mu techs out there?

Royce

hi,
maybe contact David Rossum via facebook, or here: http://www.rossum-electro.com
best regards,Bakis.



    On Tuesday, June 5, 2018, 12:51:59 PM GMT+3, rpcfender@... [vintagesynthrepair] <vintagesynthrepair@yahoogroups.com> wrote:

  


Anyone with circuit diagram or service manual?




I keep getting messages about ILL and then an address or PRC and then an address and it then locks up.




It has been intermittent for a couple of months, but it is now unusable.




I have checked leads and reseated anything with sockets as well as replacing the SRAM battery.




I replaced the SM power supply about 7 years ago and as I bought the Morpheus new I know the first lasted from '93 to 2011.

The voltages from the power supply is + and - 12v and a double wire of 5V.

The 5V supply is 4.7V loaded and 5.0V unloalded (caps going?).



As well as the audio the 12V is 7805'd and feed to the program ROM

Is this low 4.7V enough to generate such errors?


Any E-mu techs out there?




Royce